"Two diagrams are shown, each to the left of a photo, and labeled ""a"" and ""b."" Diagram a shows the outer casing of a bomb that has a long, tubular shape with a squared-off tail. Components in the shell show a tube with a white disk labeled ""Detonator"" on the left, an orange disk with a bright yellow starburst drawn around it labeled ""Conventional explosive"" in the middle and a right-facing arrow leading to a blue disk in the nose of the bomb labeled ""uranium 235."" A small blue cone next to the orange disk is shares the label of ""uranium 235."" A black and white photo next to this diagram shows a far-off shot of a rising cloud over a landscape. Diagram b shows the outer casing of a bomb that has a short, rounded shape with a squared-off tail. Components in the shell show a large orange circle labeled ""Conventional explosive"" with a series of black dots around its edge, labeled ""Detonators,"" and a yellow starburst behind it. White arrows face from the outer edge of the orange circle to a blue circle in the center with a yellow core. The blue circle is labeled ""plutonium 239"" while the yellow core is labeled ""beryllium, dash, polonium initiator."" A black and white photo next to this diagram shows a far-off shot of a giant rising cloud over a landscape."
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